From Joomla! Documentation

The Joomla! Documentation Wiki Tutorial Project is focused on 'Developers' writing, improving and maintaining Tutorials specifically for Developers. The Joomla! Docs Wiki is collaborative, community-contributed and maintained, anyone can get involved in the Developer Tutorials Project! There are many small tasks in this JDOC project that when combined together will help produce high quality tutorials for beginner and intermediate Joomla! developers. Show others your interest in the Joomla! project, sign up to help with this Docs Wiki Project.